Tommy's Blob is a single player game in which the player takes the role of a blob and pays against the computer.
There are two kinds of blobs, good blobs and bad blobs. The game starts with the bad blob already established on the screen. The player must move their good blob around the screen. Every square touched becomes another good blob. The game contain an algorithm which means that the longer the player's blob stays in a square the faster other adjacent squares become good blobs too.
The game has a player defined time limit and nine levels of difficulty.